LiveJournal SVN file naming

While I was checkouting latest livejournal version under Windows with command line client, I'd got error about some files are missed, but files are in repository and under version control!Detalied analysis shows, that there're files which differ in case in filename (for example: scrapbook.gif and Scrapbook.gif , Journal.gif and journal.gif and some others.)

Is this really bug (possibly copy-paste) or files are really should be different (possibly not only by filename)?